Studer A810...Pop, smoke risiing from vents above take up motor (left side of deck).

[rockitman]

No, take up is on the right when looking at the front. Supply is on the left. So it's reversed from the back.

All the schematics I have of that board show three caps. Looking at the board from the back, one is oriented long-ways front to back, and two right above it are next to each other oriented top to bottom. Perhaps one has been replaced with a different type, or perhaps blown itself away?

Go by the suggestions above this message. Be sure to use a 150v AC cap (or higher voltage) as suggested.

--Bill

Thanks Bill...you are right, there are 3 caps there. The one that is oriented from back to front looks like a newer cap. The other two are the old style that have blown. Thanks for that and to find an AC voltage version...

 

[bblue]

Thanks Bill...you are right, there are 3 caps there. The one that is oriented from back to front looks like a newer cap. The other two are the old style that have blown. Thanks for that and to find an AC voltage version...

It looks like a Kemet cap available from Mouser or Digikey might work:

Manufacturer: Kemet
Product Category: Suppression Film Capacitors
RoHS: RoHS Compliant Details
Capacitance: 0.47 uF
Tolerance: 10 %
Voltage Rating: 275 Volts
Termination Style: Radial
Lead Spacing: 25.4 mm
Dimensions: 15.3 mm W x 30.5 mm L x 22 mm H
Operating Temperature Range: - 40 C to + 110 C
Class: X2
Dissipation Factor DF: 1.3
Packaging: Bulk
Product: Metallized Paper Suppression Capacitors
Series: PME271M
Factory Pack Quantity: 75
Part # Aliases: P276EL474K275A

The dimensions look close, but I can't tell exactly without one of the Studer ones out for measurement.

--Bill

 

[rockitman]

It looks like a Kemet cap available from Mouser or Digikey might work:

Manufacturer: Kemet
Product Category: Suppression Film Capacitors
RoHS: RoHS Compliant Details
Capacitance: 0.47 uF
Tolerance: 10 %
Voltage Rating: 275 Volts
Termination Style: Radial
Lead Spacing: 25.4 mm
Dimensions: 15.3 mm W x 30.5 mm L x 22 mm H
Operating Temperature Range: - 40 C to + 110 C
Class: X2
Dissipation Factor DF: 1.3
Packaging: Bulk
Product: Metallized Paper Suppression Capacitors
Series: PME271M
Factory Pack Quantity: 75
Part # Aliases: P276EL474K275A

The dimensions look close, but I can't tell exactly without one of the Studer ones out for measurement.

--Bill

my lead space is about 20mm and the cap itself is 23 mm in length. Not sure the cap you show above will fit length wise.

maybe this one ?

http://www.westfloridacomponents.co...al+Film+Polyester+Capacitor+150474K250HC.html


or perhaps this one is the ticket (Nichicon):

http://search.digikey.com/us/en/products/QXL2E474KTPT/493-3628-ND/2184827

advice appreciated so that I order the right one...

 

[rockitman]

I ended up ordering the Nichicon caps....They look to be the closest fit.
http://search.digikey.com/us/en/products/QXL2E474KTPT/493-3628-ND/2184827

 

[bblue]

I ended up ordering the Nichicon caps....They look to be the closest fit.
http://search.digikey.com/us/en/products/QXL2E474KTPT/493-3628-ND/2184827

Yeah, those look good. They're metalized polypropylene instead of metalized paper but I can't imagine that making any difference for this application.

Let us know how they work out!

--Bill

 

[rockitman]

So I recapped the spooling motor control board. On the deck that was the genesis of this thread, cap replacement was successful, but I hear a clicking sound coming from the take up reel motor when fast forward or rewind. I wonder if the motor is going bad from the blown cap ? I may need to take that one in. On my other A810 that Ki has seen, I checked the caps and sure enough they were the evil Franko golden caps that exploded on my other deck. I desoldered all three and resoldered new ones to prevent any more exploding cap accidents (on that part of the machine at least). To make things more fun, the top two allen bolts holding the control board in place stripped (The allen head) prior to removing it. I had to go out and get a tap/screw extractor bit kit to get them out. I can tell this Studer service journey will be frought will challenges and exhilarations...perfect retirement activities...